path: root/src/rrd.h

#ifndef NETDATA_RRD_H
#define NETDATA_RRD_H 1

#define UPDATE_EVERY 1
#define UPDATE_EVERY_MAX 3600

#define RRD_DEFAULT_HISTORY_ENTRIES 3600
#define RRD_HISTORY_ENTRIES_MAX (86400*10)

extern int default_rrd_update_every;
extern int default_rrd_history_entries;

#define RRD_ID_LENGTH_MAX 200

#define RRDSET_MAGIC        "NETDATA RRD SET FILE V019"
#define RRDDIMENSION_MAGIC  "NETDATA RRD DIMENSION FILE V019"

typedef long long total_number;
#define TOTAL_NUMBER_FORMAT "%lld"

// ----------------------------------------------------------------------------
// chart types

typedef enum rrdset_type {
    RRDSET_TYPE_LINE    = 0,
    RRDSET_TYPE_AREA    = 1,
    RRDSET_TYPE_STACKED = 2
} RRDSET_TYPE;

#define RRDSET_TYPE_LINE_NAME "line"
#define RRDSET_TYPE_AREA_NAME "area"
#define RRDSET_TYPE_STACKED_NAME "stacked"

RRDSET_TYPE rrdset_type_id(const char *name);
const char *rrdset_type_name(RRDSET_TYPE chart_type);


// ----------------------------------------------------------------------------
// memory mode

typedef enum rrd_memory_mode {
    RRD_MEMORY_MODE_NONE = 0,
    RRD_MEMORY_MODE_RAM  = 1,
    RRD_MEMORY_MODE_MAP  = 2,
    RRD_MEMORY_MODE_SAVE = 3
} RRD_MEMORY_MODE;

#define RRD_MEMORY_MODE_NONE_NAME "none"
#define RRD_MEMORY_MODE_RAM_NAME "ram"
#define RRD_MEMORY_MODE_MAP_NAME "map"
#define RRD_MEMORY_MODE_SAVE_NAME "save"

extern RRD_MEMORY_MODE default_rrd_memory_mode;

extern const char *rrd_memory_mode_name(RRD_MEMORY_MODE id);
extern RRD_MEMORY_MODE rrd_memory_mode_id(const char *name);


// ----------------------------------------------------------------------------
// algorithms types

typedef enum rrd_algorithm {
    RRD_ALGORITHM_ABSOLUTE              = 0,
    RRD_ALGORITHM_INCREMENTAL           = 1,
    RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL = 2,
    RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL  = 3
} RRD_ALGORITHM;

#define RRD_ALGORITHM_ABSOLUTE_NAME                "absolute"
#define RRD_ALGORITHM_INCREMENTAL_NAME             "incremental"
#define RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL_NAME   "percentage-of-incremental-row"
#define RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL_NAME    "percentage-of-absolute-row"

extern RRD_ALGORITHM rrd_algorithm_id(const char *name);
extern const char *rrd_algorithm_name(RRD_ALGORITHM algorithm);

// ----------------------------------------------------------------------------
// RRD FAMILY

struct rrdfamily {
    avl avl;

    const char *family;
    uint32_t hash_family;

    size_t use_count;

    avl_tree_lock variables_root_index;
};
typedef struct rrdfamily RRDFAMILY;


// ----------------------------------------------------------------------------
// flags
// use this for configuration flags, not for state control
// flags are set/unset in a manner that is not thread safe
// and may lead to missing information.

typedef enum rrddim_flags {
    RRDDIM_FLAG_HIDDEN                          = 1 << 0,  // this dimension will not be offered to callers
    RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS = 1 << 1   // do not offer RESET or OVERFLOW info to callers
} RRDDIM_FLAGS;

#define rrddim_flag_check(rd, flag) ((rd)->flags & flag)
#define rrddim_flag_set(rd, flag)   (rd)->flags |= flag
#define rrddim_flag_clear(rd, flag) (rd)->flags &= ~flag


// ----------------------------------------------------------------------------
// RRD DIMENSION - this is a metric

struct rrddim {
    // ------------------------------------------------------------------------
    // binary indexing structures

    avl avl;                                        // the binary index - this has to be first member!

    // ------------------------------------------------------------------------
    // the dimension definition

    const char *id;                                 // the id of this dimension (for internal identification)
    const char *name;                               // the name of this dimension (as presented to user)
                                                    // this is a pointer to the config structure
                                                    // since the config always has a higher priority
                                                    // (the user overwrites the name of the charts)
                                                    // DO NOT FREE THIS - IT IS ALLOCATED IN CONFIG

    RRD_ALGORITHM algorithm;                        // the algorithm that is applied to add new collected values
    RRD_MEMORY_MODE rrd_memory_mode;                // the memory mode for this dimension

    collected_number multiplier;                    // the multiplier of the collected values
    collected_number divisor;                       // the divider of the collected values

    uint32_t flags;                                 // configuration flags for the dimension

    // ------------------------------------------------------------------------
    // members for temporary data we need for calculations

    uint32_t hash;                                  // a simple hash of the id, to speed up searching / indexing
                                                    // instead of strcmp() every item in the binary index
                                                    // we first compare the hashes

    uint32_t hash_name;                             // a simple hash of the name

    char *cache_filename;                           // the filename we load/save from/to this set

    size_t collections_counter;                     // the number of times we added values to this rrdim
    size_t unused[10];

    int updated:1;                                  // 1 when the dimension has been updated since the last processing
    int exposed:1;                                  // 1 when set what have sent this dimension to the central netdata

    struct timeval last_collected_time;             // when was this dimension last updated
                                                    // this is actual date time we updated the last_collected_value
                                                    // THIS IS DIFFERENT FROM THE SAME MEMBER OF RRDSET

    calculated_number calculated_value;             // the current calculated value, after applying the algorithm - resets to zero after being used
    calculated_number last_calculated_value;        // the last calculated value processed

    calculated_number last_stored_value;            // the last value as stored in the database (after interpolation)

    collected_number collected_value;               // the current value, as collected - resets to 0 after being used
    collected_number last_collected_value;          // the last value that was collected, after being processed

    // the *_volume members are used to calculate the accuracy of the rounding done by the
    // storage number - they are printed to debug.log when debug is enabled for a set.
    calculated_number collected_volume;             // the sum of all collected values so far
    calculated_number stored_volume;                // the sum of all stored values so far

    struct rrddim *next;                            // linking of dimensions within the same data set
    struct rrdset *rrdset;

    // ------------------------------------------------------------------------
    // members for checking the data when loading from disk

    long entries;                                   // how many entries this dimension has in ram
                                                    // this is the same to the entries of the data set
                                                    // we set it here, to check the data when we load it from disk.

    int update_every;                               // every how many seconds is this updated

    size_t memsize;                                 // the memory allocated for this dimension

    char magic[sizeof(RRDDIMENSION_MAGIC) + 1];     // a string to be saved, used to identify our data file

    struct rrddimvar *variables;

    // ------------------------------------------------------------------------
    // the values stored in this dimension, using our floating point numbers

    storage_number values[];                        // the array of values - THIS HAS TO BE THE LAST MEMBER
};
typedef struct rrddim RRDDIM;

// ----------------------------------------------------------------------------
// these loop macros make sure the linked list is accessed with the right lock

#define rrddim_foreach_read(rd, st) \
    for(rd = st->dimensions, rrdset_check_rdlock(st); rd ; rd = rd->next)

#define rrddim_foreach_write(rd, st) \
    for(rd = st->dimensions, rrdset_check_wrlock(st); rd ; rd = rd->next)


// ----------------------------------------------------------------------------
// RRDSET - this is a chart

// use this for configuration flags, not for state control
// flags are set/unset in a manner that is not thread safe
// and may lead to missing information.

typedef enum rrdset_flags {
    RRDSET_FLAG_ENABLED  = 1 << 0, // enables or disables a chart
    RRDSET_FLAG_DETAIL   = 1 << 1, // if set, the data set should be considered as a detail of another
                                   // (the master data set should be the one that has the same family and is not detail)
    RRDSET_FLAG_DEBUG    = 1 << 2, // enables or disables debugging for a chart
    RRDSET_FLAG_OBSOLETE = 1 << 3  // this is marked by the collector/module as obsolete
} RRDSET_FLAGS;

#define rrdset_flag_check(st, flag) ((st)->flags & flag)
#define rrdset_flag_set(st, flag)   (st)->flags |= flag
#define rrdset_flag_clear(st, flag) (st)->flags &= ~flag

struct rrdset {
    // ------------------------------------------------------------------------
    // binary indexing structures

    avl avl;                                        // the index, with key the id - this has to be first!
    avl avlname;                                    // the index, with key the name

    // ------------------------------------------------------------------------
    // the set configuration

    char id[RRD_ID_LENGTH_MAX + 1];                 // id of the data set

    const char *name;                               // the name of this dimension (as presented to user)
                                                    // this is a pointer to the config structure
                                                    // since the config always has a higher priority
                                                    // (the user overwrites the name of the charts)

    char *config_section;                           // the config section for the chart

    char *type;                                     // the type of graph RRD_TYPE_* (a category, for determining graphing options)
    char *family;                                   // grouping sets under the same family
    char *title;                                    // title shown to user
    char *units;                                    // units of measurement

    char *context;                                  // the template of this data set
    uint32_t hash_context;

    RRDSET_TYPE chart_type;

    int update_every;                               // every how many seconds is this updated?

    long entries;                                   // total number of entries in the data set

    long current_entry;                             // the entry that is currently being updated
                                                    // it goes around in a round-robin fashion

    uint32_t flags;                                 // configuration flags

    int gap_when_lost_iterations_above;